Tuner indicator and control



June 16, 1953 I R, c, c so 2,642,026

TUNER INDICATOR AND CONTROL Filed Sept. 2, 1950 3 Sheets-Sheet J.

INVENTOR. Rea/54972 C3 Caz r2607:

June 16, 1953 R. c. CARLSON 2,642,025

TUNER INDICATOR AND CONTROL 5 Sheds- Sheet 2 Filed Sept. 2, 1950 I" 34-I mvsm bR.

:3 Reuken C Garrison June 16, 1953 R. c. cARLsoN TUNER INDICATOR ANDCONTROL 3 Sheets-Sheet 3.

Filed Sept. 2, 1950 VENTOR.

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Patented June 16, 1953 TUNER INDICATOR AND CONTROL Reuben C. Carlson,River Grove, Ill.,'assignor to Admiral Corporation, Chicago, R1,, atcorporation of Delaware Application September 2, 1950, Serial No.183,049

Claims. (Cl. 116-124.2)

posed and obscured positions.

invention the radio receiving set comprises a chassis housed in a cab-According to the present inet in one of the walls of which is a slotwhich is ordinarily closed by a portion of the dial when the set is notin use. From its obscured position within the cabinet, the dial isadapted to be moved to an exposed position, outside of the cabinet,bythe agency of some biasing medium in response to movement of a handleor button on an external surface of the cabinet, the button being inconnection with a trigger mechanism for retaining the dial in obscuredposition. Concurrently with movement of the dial to its exposed positiona pointer, in cooperative association with the dial is released andmoved by a resilient medium to the position it last occupied withrespect to the dial-before said dial was removed from its exposed to itsobscured position. Means is also provided for opening a switch in apower circuit for operation of the radio receiving set when the dialisrmoved to its obscured position and closed when the dial is releasedtoits exposed position. Although radio receiving sets havinguncovereddials and'pointers are known to the prior art, the dials, pointers andcontrols of portable radio re ceiving sets have been protected bywindows, doors or lids as a safeguardagainst injury due to contact withobjects likely to mar the'appearance of or bend or fracture the dialsorv pointers. These precautions were also taken to exclude dust or dirtnot only from the dials and pointers but.

also from the vital parts of the radio receiver.

By means of the present invention it is possible to manufacture aportable radio receiving set in which the dial and pointer are fullyprotected when theset is not in use but which does not require the useof hinged members for such protection. By eliminating the need fordoors, lids or window panes it is possible to construct such anapparatus at a lower cost. Furthermore, the

mechanism enables the use of a relatively large dial and stationindicator mechanism on a relatively small radio without unnecessarilyenlarging the radio or detracting from its appearance.

2 Fig. l is a view, in front elevation, showing my improvedradioreceiving set as it is whennot in operation;

Fig. 2 is a View similar toFig. 1 but showing the receiving set as itappears while. in operation;

Fig. 3 is a fragmentary vertical sectional view, drawn to an enlargedscale, and taken on line 3-3 of Fig. 1, the cabinet having been removed;

Fig. 4 is a fragmentary sectional view, drawn to to an enlarged scale,and taken on line 4-4 of Fig. 3;

Fig. 5 is a fragmentary perspective view of some of the parts shown inFig. 4; v

Fig. 6 is a fragmentary elevational view of the back of the chassis,parts being broken away to reveal the'structure of other parts;

Fig. '7 is a fragmentary elevational view of the front of the chassis,parts being broken away to reveal the structure of other parts;

iFig. 8 is a top plan view of the radio receiving se Fig. 9 is anexploded view showing of the cowl structure; and

Fig. 10 is a similar view of the pointer mechanism of Fig. 5.

In Figs. 1 and 2, wherein for the purpose of i1- lustration is shown oneembodiment of the invention, the reference character 245 used to denotethe cabinet of a radio. receiving set' of the so- The radio receivingset includes novel means bywhich the current to operate it is turned onregardless of whether the set is operated by batteries, which may behoused in the lower part of the cabinet, or by current ordinarilyavailable in the home at 110 volts. This is made available by manuallydepressing a button 8. Immediately followingdepression of button 8, adial 9 and pointer l I, normally concealed within the cabinet, maketheir appearance whereupon the pointer is adapted to be moved over thedial by turning the knob 6 to tune the set to whatever broadcastingstation is desired. The dial and pointer are adapted to be rockedbetween their obscured and exposed positions, about the axis of-theknobs 6 and l, by means to be later described.

Other advantages of the invention will be apparent from the followingspecification when considered in conjunction with the accompanyingdrawings in which:

V In order to understand the unique operation 7 of my radioreceiving-set, reference should be made to Fig. 3 wherein it will benoted that the apparatus involves. use of a frame 12 which is L-shapedin transverse vertical section, the

e frame being preferably of sheet metal which is bent to the formationindicated and include: a vertical wall l3 from the base of which ahorizontal wall [4 extends laterally. The walls l3 and i4 afford rigidsupport for a tuning element, such as a variable condenser Hi, fromwhich a rotary or operating shaft l'i extends. A bushing or bearing 18,concentric with the shaft H, is rigidly fixed, at one end, to the walli3. A hub l9 on the dial 9 is journaled in the bushing i8 which engagesthe back of the dial to prevent axial displacement in one direction.Displacement of the dial axially in the opposite direction is resisted.by a spring wire clip 2| in pinched engagement with an annular groove 22on the end of hub is. As constructed, the

diameter of shaft I! is substantially less thana bore 23within this hub,through which the shaft is in extension. Consequently, hub I 9 affordsno bearing relationship for the shaft H. The pointer l 1, preferably ofsome suitable plastic material, is journaled on a bushing 24, of metalsupported by the shaft !7.

The shaft ii is also tubular and is rotated in response to rotation of amanually operative or control shaft 2% which extends within shaft H. Ingreater detail shafts ll and 25 are drivingly coupled together by aspeed reduction mechanism within the condenser It in a manner which willnot be described since it does not form a part. of the presentinvention. This speed reduction between shaft 2e and shaft H is suchthat when the knob 6, carried by shaft 25, is turned through eightrevolutions, for example,

the shaft 57 is rotated through one revolution.

The nature of a state of driving relationship between the pointer I land bushing 24 will be dealt with hereinafter.

In order to understand the mechanism comprehensively, it is advisablethat the structure of the dial be. first considered. It comprises a webportion 2?, preferably of sheet. metal, which is rigidly. fixed to theend of the hub l9 in any convenient manner. Opposite edges of webportion 2'5 are provided with flanges 23. which are arcuate of the axisof bearing E8 to which the flanges are also parallel. Flanges 28.continue to a second flange 2%} (Fig.7) describing an arc ofconsiderably greater radiusthan the. radius of the flanges 28 while.from the edgeof the. web opposite flange 29 a third and straight flange3| (Fig. 4) is struck laterally thereof. The latter flange is capped bya cowl32 which is preferably of some suitable plastic material such asBakelite. An external linear surface33 of the cowl is flush withadjacent surfaces 34 at the top of the cabinet (Figs. 1 and l). Adjacenteither of itstwo corners the cowl 32 is provided with a boss 35 which isthreaded to receive a screw 35 passing through the web portion 27, andadditionally, through a calibrated plate 31, this latter member bearingindicia denoting frequencies within the broadcasting range. Calibratedmember 3? extends to the inner'surfaces of flanges'Zii, 29 and 3|. It isalso apertured by a clearance hole 38 for the bushing 24 to passthrough. Each of. the flanges 28, on the web 21, is sandwiched betweenarcuate flanges 39 and on the ends of the cowling to resist endwisedisplacement of the cowl from the dial and this displacement is furtherresisted since the calibrated member 3'! is pinched between flanges 4iand web 2'? by clamping action of the screws 38. The flange 3! extendsbetween lateral ex- 7 tensions 42, of flanges ll and the flanged top 433 of the cowling to facilitate assembly of the parts and retain them intheir predetermined relationship to each other.

Although the pointer H is adapted to swing over the dial 9 when thereceiving set is in operating position, the position of the pointer isgoverned by the cowling 32 when the set is inactive as indicated inFig. 1. As is best shown in Figs. 4 and 5, the pointer H includes a drumor annular portion 43 in extension from a disc portion M which is spacedfrom the hub 19 by an annular flange 45 on the end of bushing 24. A hubportion 4?, on, the disc portion M, is cut away at 48 thereby providingshoulders 49 and 5! spaced from a plane passing through the diameter. ofhub 43 by a distance equal to approximately half the diameter of a setscrew 52 threaded in the bushing 2 Set screw 52 performs the function ofrigidly securing bushing 24 to the shaftl'! and also acts as a stop forengagement with. the shoulder 49 when the receiving set is. in.operation. The screw 52 and pointer H are urged to this relativeposition by aspring 53, coiled about thehub 4? and having its endsanchored to screw 52 and the pointer ii respectively, to bias saidpointer clockwise (Fig. 4). However, regardless of the position thepointer ll occupies while it and the dial are in their exposed positionthe end of the .pointer is adapted to be engaged by an internal flange54 of the cowl during the course of, manual rotation of the dial to itsobscured position within the cabinet 2 and although shoulder 48 iscarried away from the set screw 52in the course of this operation. theforce of the spring 53 immediately returns the shoulder to a state ofengagement with the screw when the dial is rocked upward again to itsexposed position. It is obvious that this operation of moving the dialand pointer away from and back totheir exposed position may be carriedout without disturbing the angular position of shaft H, and consequentlythe set screw 52.

As. has beenpreviously indicated, the dial 9 is biased away from itsobscured position. This makes necessary some means for retaining thedial in its obscured. position within the cabinet. The latter meanscomprises a trigger mechanism and includes a latch lever 5e (Fig. 7)pivoted at 5? to an adjustment arm identified in its entirety by thecharacter 58 and bolted tothe base portion M of chassis l2. Lever 5bincludes a lateral arm 59 to which a tension spring ti is anchored tobias the lever counterclockwise into engagement with a stop provided by2. lug 62 struck. outwardly from the wall 53. Near its upper end, thelever 56 is notched to provide a shoulder or stirrup 63. As the dial isrotated. counter-clockwise (Fig. 7) to its closed position, a strikermember or ear 54 struck outwardly from the web portion 2'! of thedial'engages the lever 56 and is caught by the shoulder 63. The lever 56is cooperatively associated with a slider or trigger member as which hasa slot 51, extending longitudinally thereof. A. pair of headed studs 63fixed to the wall l3 extend through the slot El so that the slider isslidably anchored for vertical movement within the limits permitted bythe studs and slot. The slider 65 is normally retained in the positionindicated regardless of the position of dial 9. This is effected by alug 8%, struck outwardly from one side of. the slider, which engages anear "H at the end. of lever 58 thus causing the slider 68 to be raisedby the spring 6!. The opposite side of slider 6t bears a flange 52 whichcontinues uply, spring 82 ward from the slider and is surmounted bythebutton 8 which, in turn, passes freely thru the top wall 34 ofthecabinet. It will now be aplever I3 is pivoted at I4 to the chassiswall I3.

The lever I3 bears a follower 16 (Fig. 7) in extension forwardly fromthe swingable end thereof through a clearance slot 11 arcuate of thepivot 14. The web portion 2! of the. dial is distended at offsetportions I8 (Fig, 3)v against which a cam 19 is'clamped by riVetsBI.The. cam I9 is apertured by a clearance opening 89 through which thebushing I8 passes. This structure enables the cam 79 to be operated inclose-proximity'to the wall I3 so that the camis adapted to cooperatewith the follower 75. "Partly responsible for this cooperation is atension spring 82 (Fig. 6) anchored to an car 83 on the lever 1-3. Thesurface of the cam 19 against which the follower I5 bears is formed inaspiral about the axis of the cam. The pressure of the spring 82 exertedthrough the follower I6, therefore urges the cam to rotate until thefollower engages the lowest point of the spiral.

It is desirable that the rotative force of the cam formoving the dial 9from its lower to its upper extreme position be applied to the dial in aspecializedmanner. Since the dial 9 is eccentrically mounted, it offersits greatest resistance to being swung upwardly at the halfway pointbetween its two extreme positions where the full weight. of theoverhanging upper part is effective as a moment about the pivot axis.Furthermore,

more force is needed to start the dial moving from rest in its lowermostposition than is necessary once it has acquired inertia. Finally, by

the time the dial has approached closely its upper-position the externalforce applied to it may be comparativelyslight or even lacking to avoidthe need for buffer means to absorb the impact. The contour of cam I9 istherefore made to conform with these needs. Follower I8 said arm bearsat one of its ends a finger 94 in engages the cam at a point in closeproximity to its point of greatest rise when the dial is in itslowermost or obscured position. Concurrentis under its greatest tension.By the time spring 92 has moved the cam to a point Whereon thefolloweris at its lowest point, the

tension or only just enough spring is under no the resistance offeredbylthe tension to overcome toward itsupper position gather adequate in''ertia to overshoot its mark, an additional and reverse rise 86 on thesurface of cam I9 is adapted to increase the tension in spring 82 toswing the dial backward to its intended position. Amore positivestop,'provided by an abutment surface 8"! at the end of rise 95, isadapted to be engaged by follower It should the inertia in the movingparts be adequateto carry the cam portion 86 over the follower farenough. Regardless of follower to movementof the cam thereover as,

surface 81! inengagement with the follower, the tension of spring 82together with the rise 86 is adequate to return a lowermost point 88, oncam 19, into engagement with the follower concurrently with the dialcoming to rest in its uppermost position. The point 83 is somewhatdepressed from the smooth spiral of the cam in order to provide a detentdesigned to hold the dial in its proper calibrated position.

In order that dial 9 may be moved from its uppermost to its lowermostposition, it is grasped and moved manually counterclockwise (Fig. 7)until the lug 64 rests on the stirrup 63. In the course ofthis-operation, lug 64 is first carried into engagement with a" camsurface 89, on the side of lever 56, to move said lever against spring5| untilthe stirrup '63 is permitted to be snapped under the lug64. Inthe operation of moving the dial to its obscured position, a stopsurfaceyor shoulder 9|, on-cam'19, may be carried into engagement withfollower 16 to limit further rotation of the dial after lug 64 has beencarried past the stirrup 63. In this event, the spring 82 returns thelug 64 to holding engagement by the stirrup 63, r

In order that the angularposition of dial 9 in its obscured position maybe minutely varied so that the ends of its straight surface 33 may be inline with the surfaces 34 of the cabinet, adjustment means for the latchlever 55 is provided. It includes the lever 58 and a cap screw 92 toanchor the lever to chassis I2. Screw 92 passes through a resilientwasher 93 and holds the lever 58 resiliently in the position shown(Figs. 6 and 7). A second screw 95 passing through the lever 58 isthreaded into the chassis'base I4 to provide adjusting means for thedevice. A second resilient washer I00 may be used to supplement theaction of the washer 93. To anchor arm 58 against forces tending torotate it about the screw 92,

extension upwardly through an aperture 96 in the chassis base wall I4.It will be apparent to those skilled in the art that the lever 58 couldbe permanently fixed to the chassis instead of using the screw 92. Inthat case, the springiness of the lever 58 would provide the biasing ofthe lever against the head of screw 95. 1

Movement of the lever I3 's responsible for a flow or interruption in afiow of electric current for operating of the radio receiving set. Thisis carried out as follows: Attached in any suitable manner to thechassis wall I3, beside lever I3, is a switch 91 (Fig. 6), the structureof which forms 'no part of the present invention and consequentis'ofsuch a nature th'atwhen its arm 99 is moved slightly past a point midwaybetween its two extreme positions, it immediately snaps to its-nearestextreme position. In the position in which arm 99 is indicated by fulllines, the switch is open. The arm 99 is bifurcated to provide a pair ofears IIII and I92, between which a lug I03 on an arm I04, of lever I3extends. This lug I93 in the course of its motion engages the ears IUIand I02, and causes the opening or closing of the switch dependent onthe direction of motion.

The chassis wall I3 provides support for a volaesaoee ume controlrheostat. (to (Fig-6) of a construction old to the rheostat art: and maybe coupled to wall 13 in any suitable manner. .The rheostat I06 bears ashaft I01 (Fig. '7) which extends through wall l3 and carries, pinnedthereto, a grooved pulley [08. On the shaft 26 (Fig. 3), is journalled agrooved pulley 199 which has a hub portion I l l on which the knob isdrivingly fixed. Turning motion of knob l is communicated to the volumecontrol I06 by a belt, cable or cord H2. which, in addition to beinglooped completely around the pulley M8, is positively coupled thereto bya lug I08. The cord H2 islikewise looped around but isnot positivelycoupled to the pulley H391 In orderto avoid. strong lateral forceson thecondenser shaft 26, it is necessary'to provide an idler puliey iii?rotatably mounted a on a bracket H5 on the chassis wall. The cord. H2passes from the pulley I99 around this idler H and'thence to a tensionspring M3 joining the ends of the cord. Because of the frictionaldriving relationship between the belt H2 and pulley The knob i is alsosupported by shaft 2fi-which is formed with a cutaway or flat H4complementary to an internal flat I E5 on the hub l H of the knob. Thehub. I H is counterbored at H8 to provide a clearance for the hub l Hsothat knob 6 may be in, close proximity to knob '5.

Having thus described my invention, I am aware thatnumerous andextensive departures may be made therefrom Without departing from thespirit or scope of my invention.

I claim:

1. Radio receiving apparatus comprising a frame housed within a cabinethaving a slot in the top thereof, the apparatus also including a shaftadapted to be turned to control the apparatus, means in connection withthe frame by which the dial is pivotally supported for rotation abouttheshaft between an upright position and through. the slot to an invertedposition within the cabinet, said dial being adapted to close said slotwhen in the inverted position, mechanism carried by the frame by whichthe dial. is releasably retained in one of the positions to which it isadapted to be moved manually, and means on the frame for urging saiddial to its other. position when released from said one position.

A plate possessing the characteristics of a dial for association withradio tuning apparatus, a hub extending normal to the plate, a straightflange in normal extension from one edge of the,

plate adjacent the hub, an arcuate flange in normal extension fromanother edge of the plate spaced to a greaterv extent fromthe hub thanthe straight flange is spaced therefrom, said arcuate pending flangesembracing at least a portion of 8 the straight. flange. andv portionsofat least" one of the-curved flanges. I

5. In a tunable apparatusfor tuning aradio having a sound reproducingapparatus having ashaft by rotation ofwhichsaid apparatus is tuned; thecombination of, indicating means including a pointer by which theposition of the shaft is indicated, bearing means on the shaft, saidpointer being journaled on said bearing means, first stop means on saidbearing means, second stop means on said pointer, resilient means aboutthe axis of the shaft and anchored to the pointer and said bearing meansto bias the respective stop means into engagement with each other there-y providing a predetermined position for said pointer with respect tothe shaft when the sound reproducing apparatus is in operation, saidpointer'being adapted to be swung away fromv its predetermined positionwith respectto the shaft when operation of the apparatus is discontinuedand returned to said predetermined position when operation is resumedwithout variance of said predetermined position.

6. In a tunable apparatus comprising a rotary shaft on rotation ofwhichsaid apparatus is tuned; the combination of, indicating meansineluding a pointer in association with the shaft, bearing means on theshaft, clamp means'in connection with the bearing means by which saidbearing means is in fixed relationship to the shaft, said pointer beingjournalled on said bearing means, projection means on the pointer, saidprojection means being adapted to limit the angular movement of thepointer to a predetermined position with respect to the shaft onengagement with said clamp means, and resilient means anchorcd to theclamp means and pointer to bias said pointer into its predeterminedposition when the sound reproducing apparatus is in operation, saidpointer being adapted to be rocked away from its predetermined positionwhen operation of the apparatus is discontinued, said pointer be-v ingreturnable to its predetermined position on resumption of operation ofsaid apparatus without angularly moving the rotary shaft.

7. In a radio receiving set comprising a shaft by rotation of which aselection of broadcasting stations is made; the combination of,indicating means including a dial andpointer means for identification ofthe station selected, said dial being angularly movable from an uprightposition, said pointer means comprising a hub, and a hand portionintegral with the hub, a bushing on'the shaft, a set screw threaded inthe bushing for clamping thereof to the shaft, said screw also beingadapted to resist axial displacement of the hubin one direction byengagement with said hub, a parti-cylindrical. hub section continuingfrom said'hub, and a spring coiled about the hub, the respective ends ofsaid spring being anchored to'said hub and the set screw to bias the hubsec tion intoengagement with said set screw thereby providing apredetermined position for the hand with respect to the shaft when thedial is in an upright position, the hand being adapted. to

be swung away from its predetermined position by the dial against forceof the spring when said dial is moved angularly and returned by'saidspring to said predetermined position when the dial is returned to itsupright position.

8. The combination with tuning apparatus and a frame therefor, thetuning apparatus having an operating shaft; of a retractable dial, and aretractable pointer in cooperative relationship to the dial forindicating the angular position of 'operating shaf-t the shaft, separatebearingmeans in connection with said dial and said pointer by which saiddial and pointer are adapted to be rotated on said shaft betweenextended and retracted positions without changing the angular positionof said shaft, means by which, the same setting of the pointer withrespect to the dial is adapted to be re-established after the dial and.pointer are moved away from and back to their extended positioncomprising a spring anchored to said pointer and said shaft tobias saidpointer to a predetermined position with respect to the angular positionof the shaft, means in said dial for engagement with said pointer tomove it away from its predetermined position by said dial when said dialis retracted. I

9. In tuning apparatus which includes a variable condenser from which anoperating shaftis in extension and the angular position of which isindicated by a dial and pointer; the combination of, means by which thedial and i' ointer are adapted to be rocked from an upright to a loweredposition and thence back to their upright position wherein the pointeris adapted to occupy the position it occupied with respect to the dialprior to being rocked with said dial comprising,'first bearing means inconnection with said dial by which it is journalled on the shaft, secondbearing means in connection with said pointer by which it is alsojournalled on said shaft, first sto p means on said shaft, second stopmeans on said pointer, and resilient means anchored to said pointer andsaid shaft to bias the respective stop means into engagement with eachother and thereby provide a predetermined position for said pointer withrespect to said shaft when said dial is in its upward position, means onsaid dial for engagement with said pointer to move it away from itspredetermined position by said dial against force of said resilientmeans when said dial is rocked to its downward position, said pointerbeing adapted to be returned to its predetermined position by saidspring when said dial is rocked to its upward position.

10. In tuning apparatus which includes an the angular position of whichis adapted to be indicated by a dial and pointer both of which the shaftbetween upright and inverted positions, the combination of, meansdrivingly coupled to the shaft by which said shaft is adapted to berotated manually to a selected position, a spring-operated mechanismcoupled to the dial to bias said dial to an upright position, resilientmeans anchored to said pointer and the shaft to bias said pointerangularly to a predetermined position with respect to said shaft andthereby indicate theposition of said shaft on said. dial when the dialis in its upright position, means on said dial for engagement with saidpointer to move it away from its predetermined position by the dial uponmovement to an inverted position, but adapted to be returned to itspredetermined position as said dial is released for return to itsupright position.

11. The combination with tuning apparatus housed within a cabinet havinga slot in one of the walls thereof, of retractable indicating apparatuscomprising a dial, and a pointer both of which are rotatable about theaxis of the shaft through the slot between an exposed position outsidethe cabinet and an obscuredpositon within the cabinet, means drivinglycoupled to the shaft by, which said shaft is adapted to be ,rotatedmanually to any selected position, first are rotatable about the axis ofl0 stop means on said shaft, second stop means on said pointer,resilient means anchored to said shaft and said pointer to bias therespective stop means into cooperative relationship to each other and tothereby provide an indicating position of said pointer with respect tothe dial when said dial is in its exposed position, the respective stopmeans being adapted to be moved out of cooperative relationship witheach other when said pointer is moved by the dial as said dial is movedaway from its exposed position, said pointer being adapted to bereturned to its indicating position by said resilient means when saiddial is returned to its exposed position.

12. In tuning apparatus which includes an operating shaft the angularposition of which is adapted to be indicated by a dial and pointer bothof which are rotatable on the shaft between upright and invertedpositions, the combination of, means drivingly coupled to the shaft bywhich said shaft is adapted to be rotated manually to a selectedposition, a spring operated mechanism in communication with the dial bywhich said dial is biased to an upright position, a trigger mechanism toreleasably retain the dial in its inverted position when swung theretomanually, resilient means anchoredto said pointer and the shaft to biassaid pointer angularly to a predetermined position with respect to saidshaft and thereby indicate the position of said shaft on said dial whenthe dial is gin its upright position, said pointer being adapted to bemoved away from its predetermined position by the dial but adapted to bereturned to its predetermined position as said dial is released byoperation of said trigger mechanism for return to its upright position.

13. The combination with tuning apparatus housed within a cabinet havinga slot in one of the walls thereof and an operating shaft in extensionfrom the tuning apparatus, of retractable indicating apparatuscomprising a dial rotatable about the axis of the shaft betweenanobscured position within the cabinet and an indicating position outsideof the cabinet, mechanism including a cam having a notch thereon fixedto the dial, a spring pressed follower adapted to cooperate with saidcam to bias said dial toward its indicating position, the dial beingadapted to be releasably retained in its indicating position bycooperation between said folspect to the shaft to thereby indicate theposition of said shaft on the dial when said dial is in indicatingposition, said pointer being adapted to be moved away from itsindicating position by the dial when said dial is moved manually awayfrom its indicating position, said dial and pointer being adapted toagain indicate the positionof the shaft when they are released forreturn to their last occupied positions.

14. The combination with tuning apparatus supported by a frame andhoused within a cabinet having a slot in one of the walls thereof and anoperating shaft in extension from the tuning apparatus, of retractableindicating apparatus comprising a dial rotatable about the axisof theshaft between an obscured position within iacsaoae the cabinetand anindicating positionoutside of the cabinet, mechanism including a camhaving a notch thereon fixed to the dial, a spring pressed followeradapted to cooperate with said cam to bias said dial toward itsindicating posi tion, the dial being adapted to be releasably retainedin its indicating position by cooperation between said follower and saidnotch, said dial being adapted to close said slot when rotated to itsobscured position, a trigger mechanism carried by said chassis to retainsaid dial in its obsoured position, said trigger mechanism being inextension through one of the walls of the cabinet for manual operationwhereby the dial is adapted to be released for movement to itsindicating position, and a pointer carried by said shaft by which theposition thereof is adapted to be'indicated on the dial when it is inits indicating position.

15. The combination with tuning apparatus supported by a frame andhoused-withina cabinet havinga slot in one of the walls thereof and anoperating shaft in-extension from the tuning apparatus, of retractableindicating apparatus comprising a dial rotatable on the shaft between anobscured position within the cabinet and an indicating position outsideof the cabinet, a cam having a notch thereon fixed to the dial, afollower lever pivoted to the frame, a follower carried by said followerlever, resilient means coupled to said lever to bias said follower intocooperation with the cam and thereby bias the dial toward its indicatingposition, the dial being adapted to be releasably retained in itsindicating position by cooperation between said follower and said notch,said dial being adapted to'close said slot when rotated to its obscuredposition, a bracket adjustably mounted on said frame, a triggermechanism carried by said bracket to retain said dial in its obscuredposition, said bracket being adjustable to assure proper closing of saidslot by said-dial in its obscured position, said trigger mechanism beingiii-extension through one of the walls of the-cabinet for manualoperation whereby the dial is adapted to be released for movement to itsindicating position, and a pointer carried-by said shaft by which theposition thereof is adapted to beindicated on the dial when it is in itsindicating position.

16. The combination with tuning apparatus for a radio receiving setadapted to be operated 'by a power circuit and including a frame withina cabinet having a slot in the top thereof, of a dial in pivotalrelationship to thejframe for movement through the slot between anupright position in response to pressure from said follower means, and aswitch in the power circuit to control operation of the radio receivingset said switch being adapted to be opened and closed in response tomovement of said dial when it is moved between its reversed and uprightpositions.

17. The combination with tuning apparatus for a radio receiving setadapted to be-operated'by a power circuit and including a frame within ai2 cabinet having a slot in the top thereof, of a dial in pivotalrelationship .to the frame for movement through the slot between anupright position and a reversed position within the cabinet, said dialin its reversed position being adapted to close said slot, latchmechanism including a movable member coupled to the frame, a handle inextension outside of the cabinet, said handle being in communicationwith said latch mechanism, a first spring coupled to said movable memberto concurrently maintain the handle in one position, said movable memberengaging said dial to maintain the dial releasably in its reversedposition, a cam about the axis of the dial and in fixed relationshipthereto, a follower lever pivoted to the frame, a follower on thefollower lever, a second spring anchored to'the follower lever and tosaid frame to bias said follower into engagement with said cam, said cambeing formed to urge said dial to its upright position in response topressure from said follower, said dial being thereby adapted to be swungto its upright position, and a switch in the power circuit to controloperation of the radio receiving set, said switch being engaged by saidfollower lever and thereby closed when the dial is moved to its uprightposition and opened when said dial is moved to its inverted position.

18. The combination with-tuning apparatus for a radio receiving setadapted to be operated by a power circuit andincluding a frame within acabinet having a slot in the top thereof, of a dial in pivotalrelationship to the frame for movement through the slot between anupright position and a reversed position within the cabinet, said dialin its reversed position-being adapted to close said slot, latchmechanism including an adjustable arm in association with the frame,resilient means between the arm and frame to bias said arm in onedirection, threaded means coupled to frame to urge the arm in theopposite direction against the force of the resilient means, a latchlever pivoted to the adjustable arm, a manually movable member movablyanchored to the frame, a springanchored to the latch lever to bias saidlatch lever into engagement with the manually movable lever, saidmanuallymovable lever being thereby adapted to be resiliently maintained'in a predetermined position, a projecting member in connection with'the dial adapted to be engaged by 'said'latch lever for releasableretention of said dial in its inverted position, a cam about the axis ofthe dial and in fixed relationship thereto, spring-pressed followermeans in pivotal relationship to 1the frame, said cam being formed tourge said dial to its-upright position in response to pressure fromsaidfollowermeans, said dialbeing adaptedto rotate to said upright positioninresponse to the urging of said cam upon release of said projectingmember by said latch lever, and a switch in the power circuit to controloperationof the radio receiving set, said switch being adapted to beopened and closed in response to motion of theidial between its uprightand inverted positions.

19. In a radio receiving set, the combination of a tuning shaftfortuning the ;receiver,-.a.movable dial supported near the inner :end ofsaid shaft and .a pointer ,zfixed to said shaft adapted to travel over.said dial to indicate thestation to which the set is :tuned, a pulley.rotatably journalled on said shaft having a control knob thereon, avolume control for said receiving set connected in driven relationshipwith said pulley.

, l3 and a tuning knob fixed to said shaft at its outer end coaxial withthe knob.

20. In radio apparatus having tuning apparatus and a volume control, thecombination of v a tuning shaft for said tuning apparatus, indicatingapparatus including a dial, and bearing means on the dial by which saiddial is rotatably supported by the shaft for movement between an uprightposition and a reversed position within the cabinet, a first pulleyjournalled on the shaft, :3. second pulley in operative communicationwith the volume control device, manual means is fixed paratus, andresilient means in engagement with the cable to tension said cable andprovide operative frictional engagement between said cable and saidfirst pulley.

21. A housing for a radio comprising a case formed with a slot in a wallthereof, a movable dial movably supported in said case, said dial beingmovable between an exposed and a retracted position and formed tosubstantially close said slot when in the retracted position.

22. A housing for a radio comprising a case formed with a slot in a wallthereof, a movable dial mcvably supported in said case, said dial beingmovable between an exposed and a retracted position and formed tosubstantially close said slot when in the retracted position, andresilient means engaging said dial to urge it to the exposed position.

23. In a radio receiving apparatus comprising a frame for support of atuning shaft and volume control apparatus all of which are supported ina cabinet having a slot in the top thereof, the

combination of, indicating apparatus including a slot is closed by thedial, a driver pulley journalled on the solid shaft, a drivable pulleyin driving communication with the volume control apparatus, a rotaryhandle in fixed relationship to the driver pulley by which said pulleyis adapted to be turned, a cord looped about both of said pulleys,anchor means in connection with the drivable pulley by which said cordis adapted to be anchored thereto at a point at the periphery thereof,and resilient means to join the respective ends of the cord, the driverpulley being thereby frictionally embraced by the cord to normallyprovide driving relationship between said driver pulley and cord andslippage therebetween when the drivable pulley is turned to limitspermitted, by the volume control apparatus.

24. A'housing for a radio comprising a case formed with a slot in a wallthereof, a movable dial movably supported in said case and movable insaid slot, said dial being movable between an exposed and a retractedposition and formed to substantially close said slot when in theretracted position, and resilient means engaging said dial to urge it tothe exposed position, and latch means engageable with said dial forholding said dial in a retracted position.

25. A housing for a radio comprising a case formed with a slot in a wallthereof, a movable dial movably supported in said case and movable insaid slot, said dial beingmovable between an exposed and a'retractedposition and formed to substantially close said slot when in theretracted position, and resilient means engaging said dial to urge it tothe exposed position, and latch means engageable with said dial forholding said dial in a retracted position, and manually .operable meansconnected to said latch and extending out of said cabinet for releasingsaid latch.

'REUBEN C. CARLSON.

References Cited in the file of this patent UNITED STATES PATENTSSwitzerland Oct. 16, 1940.

